

package com.hazelcast.client.impl;

import com.hazelcast.internal.util.counters.MwCounter;

import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import static com.hazelcast.internal.util.SetUtil.createHashSet;

/**
 * Class to hold necessary statistics for the client endpoints.
 * It is created per client type.
 */
public class ClientEndpointStatistics {

    private final MwCounter connectionsOpened = MwCounter.newMwCounter();
    private final MwCounter connectionsClosed = MwCounter.newMwCounter();
    private final MwCounter totalConnectionDuration = MwCounter.newMwCounter();
    private final Set<String> clientVersions = Collections.newSetFromMap(new ConcurrentHashMap<>());

    public void incrementConnectionsOpenedCount() {
        connectionsOpened.inc();
    }

    public void incrementConnectionsClosedCount() {
        connectionsClosed.inc();
    }

    public void incrementTotalConnectionDuration(long duration) {
        totalConnectionDuration.inc(duration);
    }

    public void addClientVersion(String clientVersion) {
        clientVersions.add(clientVersion);
    }

    public ClientEndpointStatisticsSnapshot getSnapshotAndReset() {
        // Operation below is not atomic, there might be new versions
        // added between addAll and clear, but we are fine with that.
        // If we clear more than we copy, the same client version will
        // most likely be added later.
        Set<String> clientVersionsSnapshot = createHashSet(clientVersions.size());
        clientVersionsSnapshot.addAll(clientVersions);
        clientVersions.clear();

        return new ClientEndpointStatisticsSnapshot(connectionsOpened.getAndSet(0), connectionsClosed.getAndSet(0), totalConnectionDuration.getAndSet(0), clientVersionsSnapshot);
    }

}
